Wood-chipping machine.



P. E. HEMINGS. WOOD CHIPPING MACHINE. APPLICATION FILED 11111.3, 1911.

Patented June 1'7, 1913.

Specification oi Application filed January To all whom it mag concern 1 Be it known that l, Fsrneincv: I l-lEMiNos, a citizen of the United States, siding at Carthage, in the county of (letter son and State of New York, have invented a new and useful improvement in Wood- (."hippinp Machines, of which the following is a specification.

This invention relates to wood-chipping: machines of the kind employed in the manufacture of paper for cutting wood crosswise of the grain to produce the chips from. which the wood pulp is made, and more particularly to improvements in the feed boxes of such machines. A common tvpe of these machines comprises an inclinel t box in which the wood, in the form of logs or sticks, is placed, and a rotary cutting dis; furnished on one side with knives which travel across the open lower end of the feed box to slice off the projecting ends of the logs or pieces 0% wood. in the operation of the machine, the pressure of the cutter knives on the Wood is resisted princi t allv by the bottom and outer side wall of the feed box, which is usually of substantially rect-angular shape in cross-section, and these walls are speedily worn so .as to destroy the feed box. It has therefore been customary to provide the bottom and outer side wall of the feed box with lining or wear plates which are set into these walls and receive the Wear. As these Wear plates can be renewed they greatly prolong the life of the feed box. This construction is, however, objectionable in that the separate bottom and side wear plates leave the intervening corner of the box unprotected, and this corner is worn away by the wood so that when new wear plates are put in place a cavity or so-called rat hole is left between the ad jacent edges of the new wear plates, with the result that numerous slivers are formed which do not readily disintegrate and there fore cause serious trouble in the production of the pulp.

One of the objects of this invention is to avoid this serious objection by producing a. feed box with a single wear plate of such form and arrangement that it will properly protect those portions of the Walls of the box which are subject to wear and will present an unbroken or uninterrupted wearing surface which will not leave any cavities or crevices in the box which can result in the FREDERICK HEMIBYGS, O1" NEW YGREQ,

XACHINE COMPANY, 0F

wit

E mine l formation of slivers. This result is accomse snf a ii-55a -r...

G in A CT nwior; oiupon the c that the cutter l long; as those inti'tL-i pletely across the open in the ac i JVli is (t iv one :h

teed '2 is an ration o ration in lines the is a plan Vii detached 5' for the feed box.

Like reference parts in the several SQLIY'Q.

A represents the rotary cutter of a woo end (if the chipping machine, l) the casing in which cutter revolves, and. (I too feed box for wood to be chipped. The cu er structed and mounted in the ordinary war, consisting ot" a vertical dish or wheel which is furnished at one of its vertical side faces with knives a and is secured to a hontal shaft mwhich is iournaled in suitable bearings a and is provided with fast and loose pulleys 4 a for a driving belt. or driven by any other suitable means. The cutter A and easing ii are supported by a frame or bed I secured on suitable foundation 7) The feed box (J supported by the frame 5 at one side of the cutter A in position for the cutter knives to sweep across its open lower end. The feed box is circular or sul stantially circular in cross-section and arranged to incline downwardly toward the cutter so that the wood will feed downwardly in the box to the cutter by gravity.

The box also preferably extends obliquely 7 box and is secured by rii of the knives is also exerted to the vertical plane of the axis the cutter, whereby its open lower end, which is parallel with the plane of the cutter A, the form of an ellipse which leans toward one side, and the knives of the cutter move past the end of tie box in an arc wh ch follows the general direction of the T133101 axis of this ellipse, as indicated in 3. By reason of this shape and arrange. tent of the feed box, the cutter knives do not have to he as long; as the l-cnii'rs n a 1 'lltlllllG having a rectangular feed box in (111..., to extend en lirely across the pen end of the box and properly cut a loo or a plurality o" -"l: which practically llll the box. i

in the direction of the majoinaz. ellipse and toward the bottom or thus reducing the. wear on the outer side wall thereof. l urthcrmore, if the logs or pieces, when they are reduced in length, are thrown out of their lengthwise position in the box by the cutter, they tend to roll by 'ra vity back to such lengthwise position in the bottom of the box and are thus preventcd from getting crosswise in the box.

l) represents the lining); or wear protecting the walls of the feed near. This wear plate is curv spondingly lo the interior .iri'ace o;

1 other suitable. manner, in a scat (5' in lower end of the box with its inner surface flush with the inner surface of the feed box. The wear plate covers the end portion of the curved bottom of the box and extends tip-"army preferably somewhat more than l'ia lfway up the side walls of the box, thus partially covering these curved side walls. The single curved wear plate thus covers and protects those portions of the walls of the feed box which are subject to wear, and it can be renewed small expense when worn. As there are no portions of the walls 1 the box left exposed to wear between separated wcar plates, the renewal of the wear plate cannot form any cavities or crevices which would result in the formation of slivers.

E represents the usual stationary bed knife which is confined in a guicleway e in the frame or bedl) beneath the feed box, and is provided with adjusting screws for advancing it from time to time as may be required by reason of the wearing of its cutting edge.

F is a bar slidably mounted on the bottom of the feed box and actuated by an eccentric f for clamping and firmly holdin the inner end of the bed knife I).

I claim as my invention:

1. In a wood chipping machine, the combination with a rotary vertical cutter prov and wnh knives on one of its vertical es. of a feed box for the wood located at a. side of the cutter having the knives, said feed box being of substantially circular .ss scc ion and having a lower end of elform substantially parallel with said nil having a removable curved wear 1e lmver end of said box which exoss the curved bottom and part way up the curved side walls of said feed box, substantially as set forth.

3. In wood chipping machine, the combination with a rotary cutter, of a feed box for the wood which inclines downwardly to ward the cutter and has curved bottom and side walls and is provided intcriorly in a seat at its lower end with a removable curved wear plate which extends across the curved bottom and part way up the curved side walls of the feed box, the inner edge of said wear plate intersecting the lower end face of said box in a plane substantially at right angles to the axis of said box, substantially as set forth.

In a wood chipping machine, the combination with a rotary disk cutter having a kni e in. one side thereof, of a feed box for feeding: wood to cutter, said feed box comprising a tube of substantially circular cross-section mounted at one side of the cutter at an inclination to the plane of the lattor and having a recess in the lower part of its inner surface adjacent to its mouth and extending away from the cutter and part way up the sides of the tube, and a removable curved wear plate mounted in said re and having its inner surface flush with the inner surface of the tube, substantially as set forth.

4. In a wood chipping machine, the combination with a rotary disk cutter having a knife in one side thereof, of a feed box of substantially circular cross-section mounted at one side of said cutter with its axis inclined to the plane of the cutter, said box having an open end of elliptical shape adthereof and extending up the sides of said box, substantially as set forth.

Witness my hand, this 27th day of December, 1910.

FREDERICK ELMFR llEllllNGS.

\Vitncsses J. E. OHARA, G. B. LooMIs. 

